000007768 001__ 7768
000007768 005__ 20260108160310.0
000007768 0247_ $$2DOI$$a10.3847/1538-4357/adef40
000007768 037__ $$aSCART-2026-0038
000007768 100__ $$aMaurya, Jayanand
000007768 245__ $$aThe Impact of Stellar Rotations and Binaries on the Shape of Upper Main Sequence near Turnoff in Open Cluster NGC 6067
000007768 260__ $$c2025
000007768 520__ $$aWe present the analysis of the extended main-sequence turnoff (eMSTO) in the open cluster NGC 6067. We derive the projected rotational velocity, vsini, of the stars belonging to the eMSTO region of the main sequence (MS) utilizing Gaia-ESO spectra. Our results reveal a positive correlation between vsini and the color of eMSTO stars, where fast-rotating stars predominantly occupy the red part of the MS while slow-rotating ones prefer a bluer side of the MS. The gravity-darkening effect might be a reason for this correlation. We find that most of the close binaries present in the eMSTO population would be slow-rotating due to the tidal-locking phenomenon. We identify four double-lined spectroscopic binaries (SB2) featuring slow-rotating companions, further supporting this tidal-locking hypothesis. However, the spatial distribution and the cumulative radial distribution indicate a higher concentration of red eMSTO stars in the cluster's central region than their bluer counterparts. This suggests that tidal locking is less likely to be the cause of the observed spread in rotation rates among eMSTO stars. Instead, we propose that star–disk interactions during the pre-main-sequence phase might have played a crucial role in spreading the rotation rates of stars, leading to the eMSTO phenomenon in NGC 6067.
000007768 594__ $$aNO
000007768 6531_ $$aOpen star clusters
000007768 6531_ $$aStellar rotation
000007768 6531_ $$aBlue straggler stars
000007768 6531_ $$aClose binary stars
000007768 6531_ $$aSpectroscopy
000007768 6531_ $$aSolar and Stellar Astrophysics
000007768 6531_ $$aAstrophysics of Galaxies
000007768 700__ $$aZhang, Yu
000007768 700__ $$aKamann, Sebastian
000007768 700__ $$aNiu, Hubiao
000007768 700__ $$aFrémat, Yves
000007768 700__ $$aLang, Kaixiang
000007768 700__ $$aJoshi, Y. C.
000007768 700__ $$aSamal, M. R.
000007768 700__ $$aDe Cat, Peter
000007768 700__ $$aEsamdin, Ali
000007768 773__ $$cid.123 (1--15)$$n1$$pThe Astrophysical Journal$$v989$$y2025
000007768 8560_ $$fpeter.decat@ksb-orb.be
000007768 8564_ $$s3119909$$uhttps://publi2-as.oma.be/record/7768/files/Maurya2025_ApJ989_123.pdf
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000007768 8564_ $$s25447$$uhttps://publi2-as.oma.be/record/7768/files/Maurya2025_ApJ989_123.jpg?subformat=icon-180$$xicon-180
000007768 905__ $$apublished in
000007768 980__ $$aREFERD